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Vorticity, velocity and thermal fields in flow over a wall-bounded pin matrix: a hybrid LES-RANS study

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.1930
12 pages

G. Delibra
Department of Mechanics and Aeronautics, "Sapienza " University of Rome, Via Eudossiana 18, 00184 Rome

Kemal Hanjalic
Department of Physics, Novosibirsk State University (NSU), 1, Pirogov Str., Novosibirsk, 630090, Russia; Faculty of Applied Sciences, Delft University of Technology (TU Delft), Building 58, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands

Domenico Borello
Dipartimento di Ingegneria Meccanica e Aerospaziale, 'Sapienza' Università di Roma, Via Eudossiana 18, 00164 Roma, Italy

F. Rispoli
Dipartimento di Ingegneria Meccanica e Aerospaziale, 'Sapienza' Universita di Roma, Via Eudossiana 18, 00164 Roma, Italy

Abstrakt

In search for a surrogate for expensive LES, which could still provide sufficient information about organised vortical structures that usually govern the mechanism of convective heat transfer in complex engineering configurations, we studied results of hybrid LES-RANS simulation of flow over a staggered matrix of cylindrical pins bounded by a cold and a heated plane endwall. The focus is on a comparative analysis and correlations between vortex structures, velocity- and thermal fields. In addition to the temperature contours, the thermal field is also visualized by heat-flux lines, which make it possible to identify heat "corridors" and distinguish regions dominated by stochastic turbulent transport and those of large-scale vortical convection.

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